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The prediction of the arrival time and transit speed of CMEs near the Earthis one of the key problems in understanding the solar terrestrial relationship.Although, STEREO observations now provide a multiple view of CMEs in theheliosphere, the true speeds derived from stereoscopic reconstruction of SECCHIcoronagraph data are not quite sufficient in accurate forecasting of arrivaltime of a majority of CMEs at the Earth. This is due to many factors whichchange the CME kinematics, like interaction of two or more CMEs or theinteraction of CMEs with the pervading solar wind. In order to understand thepropagation of CMEs, we have used the 3D triangulation method on SECCHIcoronagraph (COR2) images, and geometric triangulation on the J-mapsconstructed from Heliospheric Imagers HI1 and HI2 images for eightEarth-directed CMEs observed during 2008-2010. Based on the reconstruction, andimplementing the Drag Based Model for the distance where the CMEs could not betracked unambiguously in the interplanetary medium, the arrival time of theseCMEs have been estimated. These arrival times have also been compared with theactual arrival time as observed by \textit{in-situ} instruments. The analysisreveals the importance of heliospheric imaging for improved forecasting of thearrival time and direction of propagation of CMEs in the interplanetary medium.

Estimating arrival time of Earth-directed CMEs at \textit{in-situ} spacecraft using COR & HI observations from STEREO